Malicious PDF — malware analysis report

Static analysis result for SHA-256 587c1dc9d4b56bb4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94f56b06fc3ff4aaa2c32a34d3f8912f SHA-1: 4fe9af94f5d74f78d7eb888f7ebac0854c29c1b0 SHA-256: 587c1dc9d4b56bb46543e08c06218a74f1b3758e5653bcca82048f619b1e5ead
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings indicate a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=justice+league+dark+apokolips+war+full+movie+watch+online PDF link annotation
    • http://schokobrunnen.com/idata/44983813520.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sumedobedixijiwu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/vodenikemefuriwivopijexu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gevrl97ac61m960fb67hcgavlb/64859108378.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/88242868291.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/kofifozijav.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/18418695273.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/zifinavetifatoxete.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/59234088435.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wokiresepizijipunarew.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nanavexitazubokoda.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/84696623052.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c23284df6---98465798694.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/783602534.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613484bb5e8fa---39944166495.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/82371056438.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/12830541716.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109061858159617.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/piwudexesalax.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/rugeguluraberevanitesab.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wonunanaribojimoxa.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd74e2b5e7---4883610004.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 11400 bytes
SHA-256: 7fe29da023853cda522a3c9e61a0dc045869aaa37a7a8bd3db2326e8e0a6266a
font_02_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 18576 bytes
SHA-256: 867910dbe841ac8d56df4975c47da16dd28f3f208ad98f9065a68e32e6bb836f

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